diff --git a/src/rest/resource.cpp b/src/rest/resource.cpp
index 7cac3bef0b4..d7d1de6a64b 100644
--- a/src/rest/resource.cpp
+++ b/src/rest/resource.cpp
@@ -247,7 +247,7 @@ void Resource::GetCurrentNetworkPrefix(const Request &aRequest, Response &aRespo
     body = Json::PrefixList2JsonString(configList);
 
     aResponse.SetBody(body);
-    errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+    errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
     aResponse.SetResponsCode(errorCode);
     aResponse.SetComplete();
 }
@@ -293,7 +293,7 @@ void Resource::PostCurrentNetworkPrefix(const Request &aRequest, Response &aResp
     if (error == PostError::kPostErrorNone)
     {
         aResponse.SetBody(requestBody);
-        errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+        errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
         aResponse.SetResponsCode(errorCode);
         aResponse.SetComplete();
     }
@@ -339,7 +339,7 @@ void Resource::DeleteCurrentNetworkPrefix(const Request &aRequest, Response &aRe
     if (error == PostError::kPostErrorNone)
     {
         aResponse.SetBody(requestBody);
-        errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+        errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
         aResponse.SetResponsCode(errorCode);
         aResponse.SetComplete();
     }
@@ -403,7 +403,7 @@ void Resource::CurrentNetworkCommissionCallback(const Request &aRequest, Respons
         if (error == PostError::kPostErrorNone)
         {
             aResponse.SetBody(requestBody);
-            errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+            errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
             aResponse.SetResponsCode(errorCode);
             aResponse.SetComplete();
         }
@@ -489,7 +489,7 @@ void Resource::GetCurrentNetwork(Response &aResponse) const
 
     if (error == OTBR_ERROR_NONE)
     {
-        errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+        errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
         aResponse.SetResponsCode(errorCode);
     }
     else
@@ -609,7 +609,7 @@ void Resource::PutCurrentNetworkCallback(const Request &aRequest, Response &aRes
         if (error == PostError::kPostErrorNone)
         {
             aResponse.SetBody(requestBody);
-            errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+            errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
             aResponse.SetResponsCode(errorCode);
             aResponse.SetComplete();
         }
@@ -1093,7 +1093,7 @@ void Resource::PostNetworksCallback(const Request &aRequest, Response &aResponse
         if (error == PostError::kPostErrorNone)
         {
             aResponse.SetBody(requestBody);
-            errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+            errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
             aResponse.SetResponsCode(errorCode);
             aResponse.SetComplete();
         }
@@ -1159,7 +1159,7 @@ void Resource::NetworksResponseHandler(Response *                             aR
         }
 
         body      = Json::ScanNetworks2JsonString(results);
-        errorCode = mResponseCodeMap.at(HttpStatusCode::kStatusOk);
+        errorCode = GetHttpStatus(HttpStatusCode::kStatusOk);
         aResponse->SetResponsCode(errorCode);
         aResponse->SetBody(body);
         aResponse->SetComplete();